21123221322 has 32 divisors (see below), whose sum is σ = 48285964800. Its totient is φ = 6034666608.

The previous prime is 21123221299. The next prime is 21123221341. The reversal of 21123221322 is 22312232112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867429 + ... + 891447.

It is an arithmetic number, because the mean of its divisors is an integer number (1508936400).

Almost surely, 2^21123221322 is an apocalyptic number.

21123221322 is an abundant number, since it is smaller than the sum of its proper divisors (27162743478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123221322 is a wasteful number, since it uses less digits than its factorization.

21123221322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44970.

The product of its digits is 576, while the sum is 21.

Adding to 21123221322 its reverse (22312232112), we get a palindrome (43435453434).

The spelling of 21123221322 in words is "twenty-one billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty-two".